With the new Knorr-Bremse brake generation SyD7 (Synact DEVO), Knorr-Bremse has introduced the "ACR" system ("Active Caliper Release") and has developed an aftermarket solution that is easy to retrofit: the "APR" system ("Active Pad Release"). Unlike the ACR system, this spring system is attached directly to the pads and therefore actively releases the brake pads from the brake disc more quickly. It therefore compensates for the clearance between the outer pad, the brake disc, the inner pad and the tappets by quickly pressing the pads out. The APR system can be easily retrofitted by mounting it on the brake pads: Knorr-Bremse TruckServices integrates the four spring elements in brake pad kits, including the pads already prepared for installation. 
Knorr-Bremse goes one step further and combines the advantages of the APR system with an environmentally friendly, copper-free pad material quality. By eliminating copper particles in abrasion, these contribute in particular to the protection of bodies of water. The combination of copper-free pad quality and the APR system reduces the fine dust emissions that are unavoidable when braking, thereby also optimising brake pad wear.  The result: lower service costs, lower fuel costs and CO2 reduction.